HPLC Testing Services for Food Safety: A Procurement Guide

TL;DR: HPLC (high-performance liquid chromatography) testing services are contract or in-house laboratory analyses that separate and quantify chemical compounds in a food matrix — mycotoxins, food additives and preservatives, vitamins, sugars and organic acids, and certain adulterants — against a validated method and a regulatory or specification limit. For a procurement officer or lab manager, the buying decision is not “which lab runs the fastest HPLC” — it’s whether a candidate lab holds current ISO/IEC 17025 accreditation for the specific analyte and matrix you need, whether the method is validated with documented limits of detection/quantitation, and whether HPLC is even the right technique for the hazard you’re testing for. This guide covers what HPLC testing actually detects in a food safety program, how it differs from gas chromatography (GC), PCR, and general microbiological testing, and the procurement criteria to check before signing a contract.

What HPLC testing actually covers in food safety

HPLC separates compounds in a liquid sample by passing them through a column packed with a stationary phase, then detects and quantifies each one as it elutes — typically with a UV/diode-array, fluorescence, or mass-spectrometry (LC-MS/MS) detector. In a food safety program, HPLC (and LC-MS/MS, its higher-sensitivity variant) is the workhorse technique for analytes that are non-volatile, thermally unstable, or present at trace concentrations that GC can’t resolve well. Common applications a testing lab may offer under an “HPLC testing” line item:

• Mycotoxins — aflatoxins, ochratoxin A, deoxynivalenol (DON), fumonisins, and zearalenone in grains, nuts, spices, and animal feed, usually via immunoaffinity or QuEChERS extraction followed by HPLC-fluorescence or LC-MS/MS.
• Food additives and preservatives — sorbate, benzoate, sulfites, artificial sweeteners, and colorants, quantified against permitted-use limits.
• Vitamins and nutrients — water- and fat-soluble vitamin content for label-claim substantiation (see also our nutritional analysis lab guide for the broader Nutrition Facts testing picture).
• Sugars and organic acids — profiling for adulteration screening (e.g., detecting cheap syrup dilution in honey or juice) or process quality control.
• Adulterants and illegal additives — melamine, undeclared dyes, and other non-permitted substances that have driven past recalls.

Notably, HPLC is not generally the method used for pesticide residues (GC and GC-MS dominate that panel, with LC-MS/MS covering polar pesticides that don’t volatilize well — see our dedicated pesticide residue testing guide) and it is not a microbiology or pathogen-detection technique at all. A lab that markets “HPLC testing services” is answering a chemistry question, not a biology one — getting that distinction right before you scope a contract avoids paying for (or worse, relying on) the wrong panel.

Matching the method to the hazard: HPLC vs. GC vs. PCR vs. general microbiological testing

“Food safety testing methods” is not one technique — it’s a set of methods that answer different questions, and a request for proposal that doesn’t specify which one is needed is the single most common source of procurement mismatch. The four categories a buyer typically encounters:

• HPLC / LC-MS/MS — non-volatile chemical compounds: mycotoxins, additives, vitamins, sugars, some polar pesticides and veterinary drug residues.
• Gas chromatography (GC/GC-MS) for food analysis — volatile and semi-volatile chemical compounds: the bulk of the pesticide residue panel, fatty acid and lipid profiling, flavor/aroma volatiles, and residual solvents. Requires the analyte to be volatile or made volatile by derivatization, which is the practical dividing line against HPLC.
• PCR food testing — a molecular (DNA/RNA-based) method that detects the genetic signature of a target organism or species. Used for rapid pathogen screening (real-time PCR for Salmonella, Listeria, STEC) and for species-identification/food-fraud testing (e.g., confirming meat species). PCR detects the presence of genetic material, not necessarily a viable, infectious organism — a positive PCR result is typically followed by culture confirmation before a regulatory or recall decision is made.
• Microbiological testing (culture-based) — classical plate-culture methods for pathogen presence/absence, indicator organisms (aerobic plate count, coliforms, generic E. coli), and environmental monitoring swabs. Slower than PCR but remains the confirmatory reference method most accreditation schemes and regulators still require. Our food microbiology testing guide covers pathogen, indicator, and environmental-monitoring procurement in depth — food pathogen detection and microbiological testing food programs are a separate purchasing decision from chemical (HPLC/GC) testing, even though buyers often need both from the same or a coordinating lab.

In practice, a single food safety testing program usually needs more than one of these — a chemistry panel (HPLC/GC) for contaminants and additives, and a microbiology panel (culture and/or PCR) for pathogens. Ask a candidate lab which panels they run in-house versus subcontract; a lab that subcontracts a panel adds a layer of accreditation and chain-of-custody you need to verify separately.

Standards and accreditation to check before you buy

Do not evaluate an HPLC testing service on instrumentation alone (a lab having “an HPLC” in the building says nothing about whether its method is validated for your matrix). Check instead for:

• ISO/IEC 17025 accreditation, scoped specifically to the analyte and matrix you need — accreditation is granted method-by-method and matrix-by-matrix, not as a blanket lab-wide credential. Ask for the lab’s current scope of accreditation document, not just a certificate number, and confirm the accrediting body (in the US, commonly ANAB or A2LA) still lists the specific test.
• Validated, recognized methods — AOAC International Official Methods of Analysis is the most widely cited reference-method body for food chemistry testing in the US; a lab running an in-house (“modified”) method should be able to show its own validation data (recovery, precision, limit of detection/quantitation) against the reference method, not just claim equivalence.
• FSMA verification linkage — under 21 CFR Part 117, Subpart C (FDA’s Preventive Controls rule), a facility that identifies a chemical hazard requiring a preventive control must verify that control is working, and product testing is an explicit, named verification activity under 21 CFR 117.165. If your HPLC testing is feeding a food safety plan’s verification requirement, keep the lab’s accreditation and method-validation records on file — they’re what an FDA investigator or third-party auditor will ask to see.
• GFSI-scheme relevance — if your facility is certified under SQF, BRCGS, or FSSC 22000 (see our GFSI certification guide and food safety audit guide), your certification scheme may specify minimum testing frequency or accreditation requirements for outsourced analytical testing — confirm the lab’s accreditation satisfies your specific scheme’s audit checklist, not just a generic standard.

Procurement checklist: what to evaluate before signing a contract

1. Accreditation scope match — is the exact analyte/matrix combination you need (e.g., “aflatoxin B1 in peanut butter,” not just “mycotoxin testing”) listed on the lab’s current ISO/IEC 17025 scope document?
2. Method sensitivity — does the lab’s stated limit of detection/quantitation (LOD/LOQ) sit comfortably below the regulatory or specification limit you’re testing against, with enough margin for measurement uncertainty?
3. Sample preparation and stability requirements — what extraction method is used, what are the sample size, packaging, and shipping/temperature requirements, and what is the sample’s stability window before analysis?
4. Turnaround time — standard vs. rush turnaround, and whether that fits your product-release or recall-investigation timeline; ask for the lab’s typical (not just best-case) turnaround under normal workload.
5. Chain of custody and documentation — does the lab provide a certificate of analysis with method reference, uncertainty, and accreditation mark, and is there a documented chain of custody from sample receipt to result?
6. Proficiency testing participation — does the lab participate in a recognized proficiency-testing/interlaboratory comparison scheme for the specific test, and can it share recent results?
7. Cost structure — per-sample pricing, minimum order volumes, rush-fee schedules, and whether method development or validation for a non-standard matrix is billed separately.
8. Subcontracting disclosure — does the lab run the HPLC analysis in-house, or subcontract it, and if subcontracted, is the actual testing lab’s accreditation available for review?

Outsourcing HPLC testing vs. buying your own instrument

Outsourcing to an accredited contract lab makes sense for most food producers: accreditation, method validation, instrument qualification, and column/consumable management all become the vendor’s overhead rather than yours, and per-sample cost is usually lower than the fully loaded cost of an in-house HPLC program unless testing volume is high and steady. Buying an in-house HPLC system makes more sense when testing volume is high enough to justify the capital and staffing cost, when turnaround time is release-critical, or when the analyte is proprietary/novel enough that no external lab already runs a validated method for it. If you’re evaluating an in-house purchase, see our GC and HPLC column selection guide for the equipment-side procurement criteria (stationary phase, dimensions, USP classification, documentation) once you’ve decided to bring testing in-house.

Frequently asked questions

What does an HPLC testing service actually test for in food safety?

Most commonly: mycotoxins (aflatoxins, ochratoxin A, DON, fumonisins), food additives and preservatives, vitamins for label-claim substantiation, sugar/organic-acid profiles for adulteration screening, and certain non-permitted adulterants. It does not cover pesticide residues (primarily GC-based) or pathogen detection (microbiological/PCR-based).

Is gas chromatography or HPLC used for pesticide residue testing?

Both, depending on the compound. GC and GC-MS/MS cover the majority of the pesticide panel because most pesticides are volatile enough to run on GC; LC-MS/MS (HPLC coupled to mass spectrometry) covers polar, non-volatile, or thermally unstable pesticides that GC handles poorly. A comprehensive pesticide residue program typically runs both. See our pesticide residue testing guide for the full method and procurement breakdown.

How is PCR food testing different from HPLC testing?

PCR is a molecular biology method that detects the genetic material of a target organism (a pathogen or a species, for food-fraud testing). HPLC is an analytical chemistry method that separates and quantifies chemical compounds. They answer entirely different questions and are typically purchased as separate line items from a testing lab, even when bundled into the same overall food safety testing program.

Do I need ISO/IEC 17025 accreditation for HPLC testing results to be defensible?

Not legally required in every jurisdiction for every use case, but it is the standard buyers, auditors, and most GFSI certification schemes expect, because it confirms the specific method and matrix have been independently assessed for competence — an unaccredited result is harder to defend in a regulatory inquiry, a customer audit, or litigation.

What’s the difference between microbiological testing food programs and chemical (HPLC/GC) testing programs?

Microbiological testing examines a sample for living organisms — pathogens, indicator organisms, spoilage organisms — using culture-based or PCR methods. Chemical testing (HPLC/GC) examines a sample for the presence and concentration of specific compounds, whether contaminants, additives, or nutrients. Most food safety programs need both, purchased as separate (though sometimes co-located) services. See our food microbiology testing guide for the microbiological side.